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DEPARTMENT OF COMMUNITY MEDICINE - PRELIMINARY EXAMINATION

Phase III Part I (Batch 2022) | Community Medicine Paper I

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SECTION - I

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Q.1 Structured Long Question

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Option 1: Define health. Discuss the various dimensions and determinants of health. (2+4+4)

Definition of Health (2 marks)

• It introduced the concept of positive health (not just absence of disease)
• It incorporated mental and social dimensions
• It formed the basis for primary health care

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Dimensions of Health (4 marks)

• The most visible and commonly assessed dimension
• Implies a mechanically well-functioning body with a normal state of all systems
• Assessed by clinical examination, lab investigations, vital signs
• At community level: assessed by death rate, IMR, life expectancy

• Mental health is NOT mere absence of mental illness
• Defined as: "A state of balance between the individual and the surrounding world - harmony between oneself and others"
• Attributes of a mentally healthy person: free from internal conflicts, well-adjusted, has self-esteem, knows his needs/goals (self-actualization), can cope with stress and anxiety
• Assessed by mental status questionnaires administered by trained interviewers

• Social well-being implies harmony and integration within the individual, between the individual and members of society, and between individuals and the world
• Defined as "the quantity and quality of an individual's interpersonal ties and the extent of involvement with the community"
• Includes social skills, social functioning, the ability to see oneself as a member of a larger society

• Refers to that part which reaches out for meaning and purpose in life
• Transcends physiology and psychology
• Includes integrity, principles, ethics, purpose in life, commitment to some higher being

• Related to "feeling" (distinct from mental health which is "knowing/cognition")
• Identified by psychobiologists as a separate dimension from mental health

• Work plays a role in promoting both physical and mental health
• Goal achievement and self-realization in work are a source of satisfaction and enhanced self-esteem
• Loss of work can have serious health consequences

• These symbolize a huge range of non-medical factors such as social, cultural, and educational dimensions to which other sectors besides health must contribute

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Determinants of Health (4 marks)

• Genetic make-up - unique and cannot be altered after conception
• Diseases of genetic origin: chromosomal anomalies, errors of metabolism, some types of diabetes
• Medical genetics offers hope for prevention via genetic screening and gene therapy

• "Lifestyle" - the aggregation of decisions by individuals which affect their health
• Tobacco use, diet, physical activity, sexual behaviour, alcohol use - all modifiable risk factors
• Cultural practices, beliefs, and taboos affect health-seeking behaviour

• Physical environment: air, water, soil, housing
• Biological environment: agents of infection, vectors
• Social/psychosocial environment: urbanization, unemployment, social isolation
• "All that which is external to the individual human host" (MacMahon)

• Poverty is the most important determinant of ill health worldwide
• Employment, income, social class directly influence health
• WHO: "Health and socioeconomic development are inextricably linked"

• Quality, accessibility, and affordability of health services
• Coverage of immunization, maternal care, primary health care

• Malnutrition increases susceptibility to infection
• Both under-nutrition and over-nutrition have adverse health effects

• Human rights, political conditions, peace, social justice, education, housing, safe drinking water
• WHO Ottawa Charter (1986): listed "fundamental conditions and resources for health" - peace, shelter, education, food, income, stable ecosystem, social justice

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Option 2: Anaemia Mukt Bharat (AMB / Intensified National Iron Plus Initiative) (2+4+4)

Definition and Background (2 marks)

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Objectives of AMB (4 marks)

1. To reduce prevalence of anaemia in women of reproductive age (15-49 years), children (6-59 months), adolescents (10-19 years), and pregnant women
2. To decrease anaemia by 3 percentage points per year across all target beneficiary groups
3. To implement a life-cycle approach - addressing anaemia from infancy to adulthood
4. To address BOTH nutritional and non-nutritional causes of anaemia

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Six Interventions ("6x6x6 Strategy") (4 marks)

1. Children (6-59 months)
2. Children (5-9 years)
3. Adolescents (10-19 years) - girls and boys
4. Women of reproductive age (WRA, 15-49 years, non-pregnant)
5. Pregnant women
6. Lactating mothers

1. Prophylactic IFA supplementation (Iron and Folic Acid) - age and dose specific across life cycle
2. Deworming - as per National Deworming Day programme
3. Intensified year-round Behaviour Change Communication (BCC) - "Solid Body, Smart Mind" campaign focusing on:
   • Compliance to IFA and deworming
   • Appropriate infant and young child feeding (IYCF) practices
   • Increase intake of iron-rich foods through diet diversity
   • Ensuring delayed cord clamping (3 minutes) after delivery
4. Testing and treatment using digital methods and point-of-care (POC) treatment, with focus on pregnant women and school-going adolescents
5. Mandatory provision of IFA-fortified foods in government-funded programmes (ICDS, mid-day meal, PDS)
6. Intensifying screening and treatment of non-nutritional anaemia in endemic pockets - special focus on malaria, haemoglobinopathies, and fluorosis

• Implemented through ASHA, ANM, Anganwadi workers, teachers, school health nurses, and community health platforms

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Q.2 Case-Based Scenario / Applied Short Notes (Any 2 out of 3)

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Case 1: 19-year-old with fever, sore throat, rash, whitish tonsillar exudates, erythematous rash on trunk and extremities - Community Management & Preventive Strategies

Diagnosis: SCARLET FEVER (Group A beta-haemolytic Streptococcal infection - Streptococcus pyogenes)

a) Community-Based Management Measures (3 marks)

1. Case Notification: Notify the local health authority (Scarlet fever is a notifiable disease in many states)
2. Isolation: Isolate the patient for at least 24 hours after starting appropriate antibiotic therapy; the patient should not attend school until symptom-free
3. Treatment: Penicillin remains the drug of choice - oral Penicillin V for 10 days OR Benzathine Penicillin single IM injection (prevents rheumatic fever). Erythromycin for penicillin-allergic patients.
4. Contact tracing: Identify all close contacts (household, classroom). Throat swabs from symptomatic contacts; treat carriers
5. Environmental disinfection: Concurrent disinfection of articles soiled with nose and throat discharges; terminal disinfection of the room
6. Health education: Educate family and community on disease spread (respiratory droplets) and importance of completing antibiotic course

b) Preventive Strategies (3 marks)

1. No licensed vaccine currently available against Group A Streptococcus
2. Primary prevention:
   • Personal hygiene - handwashing, covering mouth/nose during coughing/sneezing
   • Avoid overcrowding in schools and homes
   • Avoid sharing utensils, towels
   • Adequate nutrition to improve host resistance
3. Secondary prevention (preventing complications - Rheumatic Fever / RHD):
   • Early diagnosis and treatment of every case of streptococcal pharyngitis
   • Complete 10-day course of penicillin (even if symptoms resolve earlier) to prevent ARF
   • Secondary prophylaxis with monthly Benzathine Penicillin for patients who develop ARF
4. Surveillance: Regular throat culture surveys in school children in endemic areas; monitor trends in rheumatic fever incidence

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Case 2: Food-borne Outbreak Investigation after Wedding Feast (Nausea, Vomiting, Abdominal Pain, Diarrhoea within 6 hours)

Diagnosis of Outbreak Type

Steps of Outbreak Investigation (6 marks) - as per K. Park

• Confirm the clinical diagnosis: collect stool, vomit, blood samples for culture and sensitivity
• Confirm it is truly an outbreak (excess over expected cases)

• Define a case definition (clinical + epidemiological)
• Count the cases, compute attack rate
• Compare with baseline (is this above the expected number?)

• Identify all persons who attended the wedding feast
• Determine total number of persons exposed
• Calculate overall attack rate = (number of cases / total exposed) × 100

• Medical survey of all attendees - interview each person who attended
• Prepare an epidemiological case sheet (name, age, sex, food items consumed, onset time, symptoms)
• Actively search for additional cases - hospitals, homes
• Collect relevant food histories - a detailed food-specific attack rate table

• Time: Construct an epidemic curve (date/time of onset). Short incubation with an explosive peak suggests a common-source, point-source outbreak
• Place: Spot map - where did the cases occur; any cluster at the venue?
• Person: Attack rates by age, sex, food items eaten

• Based on food-specific attack rates, identify the suspected food vehicle
• Food with highest attack rate among those who ate it, and lowest among those who did not = incriminated food
• Rule-in and rule-out foods using 2x2 table (Chi-square test / Fisher's exact test)

• Collect food samples from the remaining meal, kitchen surfaces, utensils
• Collect samples from food handlers (nose/throat swabs, stool)
• Send for microbiological analysis

• Remove implicated food from circulation
• Treat all affected persons
• Restrict food handlers with infections
• Improve food hygiene and kitchen sanitation

• Document all findings, conclusions, and recommendations
• Submit to health authorities

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Case 3: 30-year-old with >5 Hypo-pigmented Patches - Diagnosis and Management as per National Programme

Diagnosis: LEPROSY (Hansen's Disease - Mycobacterium leprae)

Management as per National Leprosy Eradication Programme (NLEP) (4 marks)

• Duration: 12 months (completing 12 monthly blister packs within 18 months)
• MDT is provided FREE of cost through all Primary Health Centres and Government hospitals under NLEP

1. Disability assessment at start and during treatment (WHO disability grading 0, 1, 2)
2. Leprosy Reaction management: Type 1 (reversal reaction) - steroids; Type 2 (ENL) - thalidomide/clofazimine/steroids
3. Physiotherapy and self-care: Soaking and oiling of anaesthetic hands/feet, protective footwear
4. Reconstructive surgery for established deformities
5. Counselling: Address stigma, social rehabilitation
6. Contact examination: Examine household contacts; provide chemoprophylaxis with single dose Rifampicin to eligible contacts (SDRL - Single Dose Rifampicin for Leprosy contacts)
7. Case holding: Ensure patient completes full course of MDT

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Q.3 Short Notes (Any 3 out of 4)

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1. Social Determinants of Health (3 marks)

1. Income and social protection - poverty is the single biggest determinant of ill health
2. Education - low education leads to poor health literacy, risky behaviours
3. Unemployment and job insecurity - stress, loss of income, mental health impact
4. Social exclusion and discrimination - marginalised groups have worse health
5. Housing and living conditions - overcrowding, poor sanitation, unsafe housing
6. Early childhood development - early years shape lifelong health trajectories
7. Food security - malnutrition and hunger
8. Health system access - geographic, financial, cultural barriers

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2. Role of IDSP (Integrated Disease Surveillance Programme) in Communicable Diseases (3 marks)

• Central Surveillance Unit (CSU) at National level
• State Surveillance Units (SSU) at State level
• District Surveillance Units (DSU) at District level

1. Establish a decentralised state-based surveillance system
2. Integrate existing surveillance activities
3. Train rapid response teams for outbreak investigation
4. Strengthen public health laboratories

1. Weekly reporting through S (Syndromic), P (Presumptive), L (Laboratory confirmed) forms by health facilities
2. Early warning and alert: Computer-based alert system detects unusual disease clustering - triggers field investigation
3. Outbreak detection and response: IDSP Rapid Response Teams (RRT) are deployed for outbreak investigation at district and state level
4. Data collation and analysis: Weekly disease surveillance reports generated and disseminated
5. Monitoring notifiable diseases: cholera, dengue, malaria, leptospirosis, AES, AFP, etc.
6. Laboratory network: District laboratories upgraded to test for priority pathogens; linked to state and national reference labs (ICMR/NCDC)
7. Feedback mechanism: Information flows back to peripheral health workers, enabling response

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3. Kalamazoo Consensus Statement - Essential Elements of Effective Communication (3 marks)

• Acknowledge and validate emotions: Recognize the patient's emotional state before moving to medical content ("I understand this must be difficult for you")
• Empathy: Expressing genuine understanding of the patient's experience
• Non-verbal communication: Eye contact, posture, tone of voice all convey empathy
• Use of NURS technique: Name the emotion, Understand it, Respect the patient, Support ("I'm here to help you")
• Avoid dismissal: Never dismiss or minimize the patient's emotional concerns
• These skills are part of patient-centred communication - shown to improve adherence, satisfaction, and health outcomes

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4. Methods of Nutritional Assessment of a Community (3 marks)

• Most widely used method
• Measurements: weight, height, mid-upper arm circumference (MUAC), head circumference, skinfold thickness
• Indices: Weight-for-age (wasting + stunting), Height-for-age (stunting), Weight-for-height (wasting), BMI
• Reference standards: WHO Growth Standards (2006), NCHS/CDC references
• Useful for detecting PEM (Protein Energy Malnutrition), overnutrition

• Blood tests: Haemoglobin (anaemia), serum ferritin, serum retinol (Vitamin A), serum albumin, serum calcium, urinary iodine
• Urine tests: Urinary iodine (iodine deficiency), urinary creatinine
• Identify subclinical deficiencies before clinical signs appear
• More sensitive but expensive and require laboratory facilities

• Physical examination for signs of specific deficiency diseases
• Bitot's spots (Vitamin A), Glossitis/cheilosis (Riboflavin), Koilonychia (iron deficiency), Rickets (Vitamin D), Pellagra (Niacin), Scurvy (Vitamin C), Goitre (Iodine), Kwashiorkor/Marasmus (PEM)
• Quick and inexpensive but detects only advanced deficiencies

• 24-hour dietary recall: Ask subject to recall all food eaten in the past 24 hours
• Dietary history: Usual food intake pattern over a longer period
• Food frequency questionnaire (FFQ): How often each food consumed
• Food balance sheets (at national level): FAO-based
• Duplicate meal technique
• Provides information about food intake and dietary habits of individuals or communities

• Vital statistics: Mortality rates (IMR, U5MR), disease-specific morbidity as indirect indicators
• Ecological/socioeconomic data: Food production, income, food availability, purchasing power

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Q.4 Very Short Answers (Any 5 out of 6)

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1. Use of Incubation Period in Epidemiology (2 marks)

1. Tracing the source of infection: Short incubation (hours-days) - easier to trace source, e.g., food poisoning. Long incubation - difficult.
2. Period of surveillance/quarantine: Surveillance period = maximum incubation period of the disease
3. Immunization: Knowledge of incubation helps administer immunoglobulins/antisera prophylactically to prevent clinical illness
4. Identification of type of epidemic: Point-source epidemic - all cases within ONE incubation period; propagated epidemic - cases occur beyond one incubation period
5. Prognosis: In some diseases (tetanus, rabies) - shorter incubation = worse prognosis

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2. Contact Tracing in STD (2 marks)

1. Provider referral (Health officer initiated): Health worker traces and notifies contacts
2. Patient referral (Self-referral): Patient is counselled to notify their own contacts
3. Contract referral: Patient agrees to notify contacts within a specified time; if not done, health worker steps in

• Breaks the chain of transmission
• Identifies asymptomatic cases who may continue spreading infection
• Allows early treatment of partners (prevents complications)
• Particularly important for HIV, syphilis, gonorrhoea, chlamydia
• "Cluster testing" - extending contact tracing to contacts of contacts

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3. Define Acculturation (2 marks)

• It refers to changes in attitudes, values, behaviours, and identity that occur when individuals from one culture come into sustained contact with a different culture
• The original culture of the group is modified by contact with a different culture
• Acculturation occurs in immigrants, refugees, and indigenous peoples exposed to dominant cultures
• Can be assessed along four strategies: integration, assimilation, separation, marginalisation
• Public health relevance: Acculturation affects dietary practices, health-seeking behaviours, mental health, substance use, and risk of non-communicable diseases

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4. Define Herd Immunity (2 marks)

• When large numbers of a population are immune, it is difficult to maintain a chain of infection
• The higher the proportion immune, the lower the likelihood that a susceptible person contacts an infectious agent
• Elements contributing to herd immunity: (a) clinical and subclinical infection in the herd, (b) immunization of the herd, (c) herd structure
• Herd immunity threshold: The proportion of immune individuals above which the disease may no longer persist - varies with virulence, vaccine efficacy, and contact parameters
• Determined by serological surveys
• Example: Eradication of smallpox and control of poliomyelitis used herd immunity principles
• Note: Herd immunity does NOT protect against tetanus (soil-borne, not person-to-person)

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5. Define Attributable Risk (2 marks)

AR = Incidence rate in exposed group - Incidence rate in non-exposed group

AR% = [(Ie - Ino) / Ie] × 100

• Incidence in smokers: 10 per 1,000
• Incidence in non-smokers: 1 per 1,000
• AR% = (10-1)/10 × 100 = 90%
• This means 90% of lung cancer in smokers was attributable to their smoking

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6. State Two Examples of Propagated Epidemic (2 marks)

1. Hepatitis A - faeco-oral transmission; gradual build-up of cases in a community with person-to-person and food-to-person spread
2. Poliomyelitis - faeco-oral spread; cases occur in waves as susceptibles are infected by primary cases

• Gradual rise, tails off slowly
• Transmission until susceptibles are depleted
• Speed depends on herd immunity, contact opportunities, and secondary attack rate
• More likely where large numbers of susceptibles are aggregated

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